Solar cell module

Abstract

The present invention provides a solar cell module, which comprises: a back panel, a rear package layer, a plurality of mutually spaced solar cells, a front package layer, and a light-transmissive element, which are successively disposed along a thickness direction of the solar cell module. The solar cell module further comprises at least one light redirecting film, each light redirecting film comprising an optical structure layer. The light redirecting film is disposed on a surface, opposite to the side where the solar cells are located, of the rear package layer; the position of the light redirecting film corresponds to a region between the solar cells. The optical structure layer faces the rear package layer, such that the optical structure layer reflects the light towards an interface between the light-transmissive element and the air; and the light is then totally internally reflected to light-facing surfaces of the solar cells. The solar cell module has high electricity generation efficiency, and is further optimized in optical gain, electrical insulation property, and thermal/mechanical stress properties.

1 . A solar cell module, the solar cell module comprising: a back panel, a rear package layer, a plurality of mutually spaced solar cells, a front package layer, and a light-transmissive element, which are successively disposed along a thickness direction of the solar cell module, wherein the solar cell module further comprises at least one light redirecting film, each light redirecting film comprising an optical structure layer; the light redirecting film is disposed on a surface, opposite to a side where the solar cells are located, of the rear package layer; the position of the light redirecting film corresponds to a region between the solar cells; the optical structure layer faces the rear package layer, such that the optical structure layer reflects light towards an interface between the light-transmissive element and the front package layer; and the light reflected by the optical structure layer is propagated to an interface between the light-transmissive element and the air, and is then totally internally reflected from the interface between the light-transmissive element and the air to the surfaces of the solar cells. 
     
     
         2 . The solar cell module according to  claim 1 , wherein the solar module comprises an adhesive tape, a part of the adhesive tape being adhered onto a surface, away from the rear package layer, of the light redirecting film; another part of the adhesive tape being adhered to a surface of a side, different from the side where the solar cells are located, of the rear package layer, so as to affix the light redirecting film onto the surface of the side, different from the side where the solar cells are located, of the rear package layer. 
     
     
         3 . The solar cell module according to  claim 1 , wherein the light-transmissive element is made of glass; and the front and rear package layers comprise ethylene-vinyl acetate (EVA). 
     
     
         4 . The solar cell module according to  claim 1 , wherein each optical structure layer comprises: a microstructure layer; a reflective layer, made of metal, disposed on the microstructure layer; and an optional transparent insulating layer disposed on the reflective layer. 
     
     
         5 . The solar cell module according to  claim 4 , wherein the microstructure layer comprises a plurality of triangular prisms; and vertex angles of the triangular prisms range from 100° to 140°. 
     
     
         6 . The solar cell module according to  claim 5 , wherein straight lines perpendicular to the triangular prisms' smallest cross sections are defined to be trends of the triangular prisms; and the trends of the triangular prisms are parallel to the length direction of the light redirecting film, on which the triangular prisms are located. 
     
     
         7 . The solar cell module according to  claim 5 , wherein straight lines perpendicular to the triangular prisms' smallest cross sections are defined to be trends of the triangular prisms; and the trends of the triangular prisms form an angle with respect to the length direction of the light redirecting film, on which the triangular prisms are located. 
     
     
         8 . The solar cell module according to  claim 7 , wherein the angle ranges from 1° to 89°. 
     
     
         9 . The solar cell module according to  claim 4 , wherein the transparent insulating layer comprises silicon oxide. 
     
     
         10 . The solar cell module according to  claim 9 , wherein the silicon oxide comprises silicon dioxide; and the transparent insulating layer has a thickness of from 20 nm to 100 nm. 
     
     
         11 . The solar cell module according to  claim 4 , wherein the transparent insulating layer comprises one or a plurality of the following materials: EVA, polyolefin (PO), and low-density polyethylene (LDPE). 
     
     
         12 . The solar cell module according to  claim 4 , wherein the transparent insulating layer comprises one of the following materials, or a material formed after cross-linking a plurality of the following materials: EVA, PO, and LDPE. 
     
     
         13 . The solar cell module according to  claim 1 , wherein a total thickness of the light redirecting films ranges from 20 μm to 150 μm. 
     
     
         14 . A solar cell module, the solar cell module comprising: a rear light-transmissive element, a rear package layer, a plurality of mutually spaced solar cells, a front package layer, and a front light-transmissive element, which are successively disposed along a thickness direction of the solar cell module, wherein the solar cell module further comprises at least one light redirecting film, each light redirecting film comprising an optical structure layer; the optical structure layer is disposed on a surface, inside the solar cell module, of the rear light-transmissive element; the position of the optical structure layer corresponds to a region between the solar cells; and the optical structure layer faces the rear package layer, such that the optical structure layer reflects the light towards an interface between the front light-transmissive element and the front package layer; and the light reflected by the optical structure layer is propagated to an interface between the front light-transmissive element and the air, and is then totally internally reflected from the interface between the front light-transmissive element and the air to the surfaces of the solar cells. 
     
     
         15 . The solar cell module according to  claim 14 , wherein the light redirecting film is disposed on the surface, inside the solar cell module, of the rear light-transmissive element by using an adhesive; and the adhesive comprises an ultraviolet absorbent. 
     
     
         16 . The solar cell module according to  claim 14 , wherein the front and rear light-transmissive elements comprises glass, and the front and rear package layers are made of ethylene-vinyl acetate (EVA). 
     
     
         17 . The solar cell module according to  claim 14 , wherein each optical structure layer comprises: a microstructure layer; a reflective layer, made of metal, disposed on the microstructure layer; and an optional transparent insulating layer disposed on the reflective layer. 
     
     
         18 . The solar cell module according to  claim 17 , wherein the microstructure layer comprises a plurality of triangular prisms; and vertex angles of the plurality of triangular prisms range from 100° to 140°. 
     
     
         19 . The solar cell module according to  claim 18 , wherein straight lines perpendicular to the triangular prisms' smallest cross sections are defined to be trends of the triangular prisms; and the trends of the triangular prisms are parallel to the length direction of the light redirecting film, on which the triangular prisms are located. 
     
     
         20 . The solar cell module according to  claim 18 , wherein straight lines perpendicular to the triangular prisms' smallest cross sections are defined to be trends of the triangular prisms; and the trends of the triangular prisms form an angle with respect to the length direction of the light redirecting film, on which the triangular prisms are located. 
     
     
         21 - 26 . (canceled)